Hopefully, withing the next month I will begin construction on a new home. Some lumber suppliers are suggesting that I use 7/16" OSB instead of 5/8" plywood for my roof decking since it is less expensive. They say the structural ratings of 7/16 OSB is the same as 5/8 plywood. That is hard for me, of little experience, to believe. I want what will be best and will provide a straight, smooth roofline for the rest of my life. What has experience shown the pro's?